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Other Income (Tables)
 12 Months Ended
Dec. 31, 2019
TextBlock [abstract]  
Summary of Other Income
 
   
Years Ended December 31
 
   
2017
   
2018
   
2019
 
   
NT$
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
   
(In Millions)
 
Interest incom
e
      
Bank deposits
  $6,412.8   $10,310.7   $11,454.0 
Financial assets at FVTPL
   —    382.7    339.5 
Financial assets at FVTOCI
   —    3,078.6    3,476.2 
Financial assets at amortized cost
   —    922.4    919.7 
Available-for-sale
financial assets
   2,091.4    —    — 
Held-to-maturity
financial assets
   568.6    —    — 
Structured product
   391.9    —    — 
  
 
 
   
 
 
   
 
 
 
   9,464.7    14,694.4    16,189.4 
Dividend income
   145.6    158.4    417.3 
  
 
 
   
 
 
   
 
 
 
  $9,610.3   $14,852.8   $16,606.7